# Deformation-resistant carbides and borides with superior hardness, toughness, and flexural strength up to 2000 °C. 

https://mdr.nims.go.jp/datasets/dde1458d-2c61-4ba1-9886-08a1ccc45a44

## File

- [abstract VASYLKIV jksc38-0173 JK38.pdf](https://mdr.nims.go.jp/filesets/d493d9da-834d-41b9-9f7d-3ab53c969e9f/download) ([Detail](https://mdr.nims.go.jp/filesets/d493d9da-834d-41b9-9f7d-3ab53c969e9f.md))

## Id

dde1458d-2c61-4ba1-9886-08a1ccc45a44

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2024-11-15T07:12:51.826063Z

## Updated at

2024-11-21T07:35:57.856108Z

## Published at

2024-11-21T07:35:57.905500Z

## Doi

https://doi.org/10.48505/nims.4983

## First published url



## Date published



## Recorded date published



## Resource type

conference_presentation

## Manuscript type

na

## Collection



## Title

- title: 'Deformation-resistant carbides and borides with superior hardness, toughness,
    and flexural strength up to 2000 °C. '
  title_type: original
  lang: en

## Description

- description: 'I will discuss the resistance to ultrahigh-temperature deformation
    of boron, boron carbide, Ta0.2Hf0.8C, Zr-Ta multi-boride, tantalum monoboride,
    and tantalum diboride. The mechanism of ultra-high temperature flexure & strain-driven
    amorphization in polycrystalline B4C has been analyzed. With RT to 1800 °C mean
    strength of 650 MPa, boron carbide exhibits ultrahigh flexural strength far exceeding
    1000 MPa, accompanied by a change in the deformation mechanism from brittle fracture
    to plastic at 2000 °C. Depending on the loading rate, B4C showed 1000 - 8400 MPa
    strength with a plastic stress-strain curve. Even deformation in an elastic manner
    at 25 mm/min resulted in a strength of 675 MPa, confirming its deformation resistivity.  Zr-Ta
    multiboride ceramic was formed with an artificially created hierarchical superstructure
    via reaction-driven consolidation of ZrB2, Ta, and amorphous B powders. Due to
    the formation of the (Zr, Ta)B2 solid solution multiboride ceramic composite exhibited
    ultra-hardness of 28.6±3.2 GPa at 98 N and 22.6±0.6 GPa at 196 N, and the flexural
    strength 400 MPa up to 2000 °C [3]. Deformation-resistant Ta0.2Hf0.8C solid-solution
    ceramic with superior flexural strength at 2000°C showed toughness and a strength
    of 3.4 ± 0.4 MPa m1/2, 500 ± 20 MPa. The bending tests show that at 1800 °C and
    after, TaB''s loading curves exhibited nonlinear characteristics associated with
    flaw healing or plasticity (micro-plasticity) contribution. '
  description_type: abstract
  lang: eng

## Creator

- name: VASYLKIV Oleg
  role: author
  orcid: https://orcid.org/0000-0002-5041-6130
  organization: National Institute for Materials Science
  department: Research Center for Electronic and Optical Materials/Optical Materials
    Field/Polycrystalline Optical Material Group

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## Keyword

- subject: Hardness and toughness
  schema: not_defined
- subject: Flexural Strength
  schema: not_defined
- subject: Deformation-resistant carbides and borides
  schema: not_defined
- subject: UHTC
  schema: not_defined

## Rights

- identifier: http://rightsstatements.org/vocab/InC/1.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal



## Conference

name: The 38th International Japan-Korea Seminar on Ceramics
start_date: 2024-10-31
end_date: 2024-11-02
identifier: https://jkceramics38.com/

## Related item



## Funding

- identifier: AB3080
  funder_name: NIMS
  description: "多結晶光学材料\tResearch toward Innovative Optical Materials"

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## Fileset

- id: d493d9da-834d-41b9-9f7d-3ab53c969e9f
  filename: abstract VASYLKIV jksc38-0173 JK38.pdf
  content_type: application/pdf
  size: 274803
  md5: c2405e4c7cdebfdbd638e7b18836f691

## Thumbnail

fileset_id: d493d9da-834d-41b9-9f7d-3ab53c969e9f
filename: abstract VASYLKIV jksc38-0173 JK38.pdf